Keep changing channels.

I got this log on my WC all the time, massive every day.
Channel changed for Base Radio MAC: xx:xx:xx:xx:xx:xx on 802.11a radio. Old Channel: 36. New Channel: 36. Why: Radar. Energy before/after change: 0/0. Noise before/after change: 0/0. Interference before/after change: 0/0.
It said change channel from 36 to 36. and no improvment on any apsects.  It happened on many different MAC addresses.
What could cause this?  My users some time complain lossing - reconnecting to wireless from time to time, could it be related?
Thanks a lot for any help or clue.
Appreciated.

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtt07331
Enjoy
Please make sure to rate correct answers

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